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Variations in Stable Carbon Isotopic Composition of n-Alkanes from Ordovician and Triassic-Derived Oils in Lunnan Oilfield, Tarim Basin, NW China: Global Paleoenvironmental Constraints
引用本文:卢鸿,孙永革,彭平安.Variations in Stable Carbon Isotopic Composition of n-Alkanes from Ordovician and Triassic-Derived Oils in Lunnan Oilfield, Tarim Basin, NW China: Global Paleoenvironmental Constraints[J].中国地球化学学报,2004,23(3):207-219.
作者姓名:卢鸿  孙永革  彭平安
作者单位:StateKeyLaboratoryofOrganicGeochemisto,GuangzhouInstituteofC,eochemistr~,ChineseAcademyofSciences,Guangzhou510640,China
摘    要:Molecular stable carbon isotope technique was employed to study well-sourced crude oils collected from a single drilling well and from the entire Lunnan oilfield, Tarim Basin, NW China. The stable carbon isotopic composition of n-alkanes from crude oils showed that Ordovi-clan-derived oils are enriched in ^13C and Triassic-derived oils are depleted in ^13C. This is consistent with the distribution and evolution trend of stable carbon isotope ratios in crude oils/organic matter from all over the world in geological history (Stahl, 1977; Andrusevich et al. ,1998). An extensive survey of literature indicates that, except for thermal maturity, organic matter input and depositional environment, paleoenvironmental background is another key factor that affects the stable carbon isotopic composition of Ordovician- and Triassic-derived crude oils. The results showed that gas chromatographic-isotope ratio mass spectrometry ( GC-C-IRMS), combining with biogeoehemical evolution of organic matter in geological history, may be a powerful tool in refining oil/oil, oil/source correlations in multi-age, multi-source petroliferous basins like Tarim.

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Variations in stable carbon isotopic composition of<Emphasis Type="Italic">n</Emphasis>-alkanes from Ordovician- and Triassic-derived oils in Lunnan oilfield,Tarim Basin,NW China: Global paleoenvironmental constraints
Lu Hong,Sun Yongge,Peng Ping’an.Variations in stable carbon isotopic composition ofn-alkanes from Ordovician- and Triassic-derived oils in Lunnan oilfield,Tarim Basin,NW China: Global paleoenvironmental constraints[J].Chinese Journal of Geochemistry,2004,23(3):207-219.
Authors:Lu Hong  Sun Yongge  Peng Ping’an
Institution:(1) State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China
Abstract:Molecular stable carbon isotope technique was employed to study well-sourced crude oils collected from a single drilling well and from the entire Lunnan oilfield, Tarim Basin, NW China. The stable carbon isotopic composition ofn-alkanes from crude oils showed that Ordovician-derived oils are enriched in13C and Triassic-derived oils are depleted in13C. This is consistent with the distribution and evolution trend of stable carbon isotope ratios in crude oils/organic matter from all over the world in geological history (Stahl, 1977; Andrusevich et al., 1998). An extensive survey of literature indicates that, except for thermal maturity, organic matter input and depositional environment, paleoenvironmental background is another key factor that affects the stable carbon isotopic composition of Ordovician-and Triassic-derived crude oils. The results showed that gas chromatographic-isotope ratio mass spectrometry (GC-C-IRMS), combining with biogeochemical evolution of organic matter in geological history, may be a powerful tool in refining oil/oil, oil/source correlations in multi-age, multi-source petroliferous basins like Tarim. This project was supported by the Knowledge Innovation Project of the Chinese Academy of Sciences (Grant No. KZCX1-SW-18) and the State 973 Project (Grant No. G1999043308).
Keywords:molecular stable carbon isotope technique            n-alkanes  Ordovician- and Triassic-sourced oils  paleoenvironmental constraints  Tarim Basin
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